摘要
Ultrafast pump-probe spectroscopy of poly(3-hexylthiophene) (P3HT) films was performed using a 9-fs laser and a broadband lock-in detection system. The fast geometrical relaxation (GR) time was attributed to the transition from a free exciton (FE) to form a bound polaron pair (BPP), and the time constant was estimated to be τGR = 90 ± 2 fs. The relaxation time constant of BPP was determined as τBPP = 710 ± 40 fs. The measurement of pump-power dependence enabled us to distinguish the defect trapping process of BPPs from other parallel decay processes and to determine the defect concentration of a P3HT thin film.
原文 | English |
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頁(從 - 到) | 71-76 |
頁數 | 6 |
期刊 | Chemical Physics Letters |
卷 | 498 |
發行號 | 1-3 |
DOIs | |
出版狀態 | Published - 30 9月 2010 |